Allow GrGLEffects to produce variable length keys.

include/gpu/GrTBackendEffectFactory.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrTBackendEffectFactory_DEFINED
 #define GrTBackendEffectFactory_DEFINED
 
@@ skipping 31 matching lines @@
 
     /** Returns a human-readable name for the effect. Implemented using GLEffect::Name as described
      *  in this class's comment. */
     virtual const char* name() const SK_OVERRIDE { return EffectClass::Name(); }
 
 
     /** Implemented using GLEffect::GenKey as described in this class's comment. */
     virtual void getGLEffectKey(const GrDrawEffect& drawEffect,
                                 const GrGLCaps& caps,
                                 GrEffectKeyBuilder* b) const SK_OVERRIDE {
-        EffectKey effectKey = GLEffect::GenKey(drawEffect, caps);
-        b->add32(effectKey);
+        GLEffect::GenKey(drawEffect, caps, b);
     }
 
     /** Returns a new instance of the appropriate *GL* implementation class
         for the given GrEffect; caller is responsible for deleting
         the object. */
     virtual GrGLEffect* createGLInstance(const GrDrawEffect& drawEffect) const SK_OVERRIDE {
         return SkNEW_ARGS(GLEffect, (*this, drawEffect));
     }
 
     /** This class is a singleton. This function returns the single instance. */
     static const GrBackendEffectFactory& getInstance() {
         static SkAlignedSTStorage<1, GrTBackendEffectFactory> gInstanceMem;
         static const GrTBackendEffectFactory* gInstance;
         if (!gInstance) {
             gInstance = SkNEW_PLACEMENT(gInstanceMem.get(),
                                         GrTBackendEffectFactory);
         }
         return *gInstance;
     }
 
 protected:
     GrTBackendEffectFactory() {}
 };
 
 #endif